Speed control mechanism



Oct. 24, 1950 I s, BROWN SPEED CONTROL MECHANISM 4 Sheets-Sheet 1 FiledMarch 24, 1947 UCL 24, 1950 Yl.. s. BROWN 2,526,726

v SPEED CONTROL MECHANISM Filed March 24, 1947 4 sheets-sheet 2 HIGH,

SPEED M01-0R' Rssmwlok '155 ELEG,v 15.5 Moms 154", PUMPS lA-l Y Lowspeso HIGHSPEED vALva 158 159 VALVE :1E-16o 1anz1b,hhlshl l l In! A 1620o SPEED CONTROL INVENTOR Hl ATTORNEY Oct. Z4, 1950 s. BROWN SPEEDCONTROL MECHANISM 4 ,Sheets-Sheet 3 Filed March 24, 1947 INVENTOR LAwREcaSRowN BY ms ATTORNEY Oct. 24', 1950 s. BROWN SPEED CONTROL MECHANISM 4Sheets-Sheet 4 Filed March 24, 1947 lNvENToR LAwR /vcs BRow/v ms ATTOREYjatentec ct. 2:4,

2,526,726? sr'EnCoNTRoLfii/.IEH ANsM' Lawrence 8. Bron/nl, Long'vIsland. City', N.z asf.- I' s'ignorto TheSperry Cclip'ratioii, acorporationl of Delaware ApplicatioMarcll 24', 1947, Serial No, 736172@This `invention relates to driving means for y"paper'box machines orthelike having a plurality rofelements which are to be driven at differentspeeds having selected ratios, and as for an object to yprovide speedcontrol mechanism having 3 Claims. (ol. 74-471) mea-ns forsimultaneously varyingthe speeds of theV var-ious driven elements whilemaintaining l-thel selected speed ratios therebetween.

` Another object is to provide a mechanism .fof lthe above typeincluding hydraulic driving means vrwith speed control mechanismsinter-related toV produce the aboveresults.

Another object is to provide driving means of the above type having asimple adjusting mechanism for adjusting the speed ratios to any desiredvalue and for maintaining 'the selected ratio jthroughoutthe speedrange'of the machine.

Various other objects ande-advantages will be apparent as the -nature ofthe invention is more Y fully disclosed. Y 'Theipresent invention isparticularly applicable -'to a paper aboX folding and gluingrmaohine ofthe v"type shown in the Stande" PatentrNo. 2,349,204,

dated May 16, 1944. folding and gluing section including belt con-Y-ve'yors which feed the folded and glued blanks at vpredetermined ratesand a stacking mechanism including a separate belt conveyor towhich thefolded blanks are fed and stacked from the first "conveyor,

last conveyor through adrying zone wherein Vthe glue is` dried. The rateof feed of the stack con'- veyor belt is slower than that of the firstconzveyor belt and is selected to provide the necessary drying time. Theratio between the speeds off the two belts results in stacking thefolded -blanks on the slower conveyor belt with a certain overlap orshingling, the amount lof overlap being a function of the speed ratio ofthe tworbelts. This operation is shown-and described in conl-nectionwith-Fig. 2 of the above mentioned Staude patent and only so much'thereof is shown in the present application as is necessary to anunderstanding of this invention.

A'Ill'ieriresent inventionprovides hydraulic driving'v motors fordriving therespective conveyor belts and control valves for controllingthe speeds 'of the individual mctors.` The control valves are actuatedby van interlocked control mechanism which isadapted to maintain aselected speed ratio between the rates of travel of the two belts Thismachine includesl -a The stacked blanks are fed on the.

teristie of' this invention are pointed out more particularly in theclaims, the nature' of they invention will be` better understood byreferring t0 the following description taken. in connection withv the'accompanying drawings in which 'a specic embodiment -thereofhas beenset yforth for purposesof illustration.

In the draw-ings# Y y v Fig. y'1 is a longitudinal section through aIportion* of" the stacking "machine showing the two feed belts; .Y

Fig. 2 is 'a diagrammatic view showing the hy- Vdraulic drive mechanismand control valves;H 'i 3 is a lfront-elevation of the control mecha-`nis'm lon a larger scale; and ,1 .e

l' Figa is afsection-on the line 4`4 of Fig. 3a` l' vv'fl-lc'rrfanillustration of one type of mach-ineptov which" the present inventionmay be applied, 'reference is made tolFig. 1 which shows a portion .ofthe' folded'box blank feeding and `stacking 'ine'chanism illustrated inthe Stande patent above ,.mention'ed.. In this figure' theV folded'. box.blanks .'liiiare shown as conveyed by a lower conveyor `belt 95= whichis driven over a-'series `of idler.r .pulleys ySli by a drive pulley 91mounted on a shaft'l.

`The :blanks I0 a'rerheld against fthe belt 35 by' an together/bypressure devices, including apresser belt :|04 'and a presser roller|05; for a-fsuicie'rit l period of time fory the glue'dparts toset. Thestacker belt |02 is showin as driven byaidrivinvg rol-lerllvthro'ughbeveled gears from'a-dri've saar-tf l fz. 'f 'rae-belt fl 02passes over an adjustable idler pulley v I3 'which is mounted foradjustment in 'a V'slotted bracket 44 which i-s\ pivoted to a 4bracketvf| |6"'by'a pin-|11 and isadjus'ta'ble bya'n arcuaterack ||8 on an'extension |f|19-l of the bracketl l'4.- `The rack ||8enga`ges anadjusting gear-^|20. The roller |0'5 is mounted on Ya pivoted bracket|2| and may be adjusted elevation'by arbracket |22 pivoted at `|23 andcarrying -a segment rackv |24 engageclby `an adjusting gear |25j'ou-rnaledin anxedfbrack'et |26. v VV-Tlfie adjusting rod |f|l| for theupper" belt 98 is secured in a1bracket. |30 pivoted at- |3| toraiixedxsupport |32.and carries Iat its Vupper. 'endf 'a rollerlll'33.` Anidlerifroller |34 is mounted vconis mounted on an arm |31 attached tothe rod I| and cooperates with the pulley 96 to apply Y pressure to thefolded blanks l0.

The belt 95 is driven through beveled gears |40 from a drive shaft I4I.The shafts 13 and 13 are geared together for driving the belts 95 and 98in unison.

It is to be understood that the drive has been shown as applied to thepulleys 91 and ||0 merely for purposes of illustration. The drive may ofcourse be applied to any selected belt pulley,

such as the pulley at the trailing end of theV belts so as to hold thetop runs of the belts under tension. This invention is concerned withthe means for applying power to the drive shafts ||2 and 14|. The drivenelements may be variously located as desired.

It is noted that the blanks I0 are stacked on the belt |02 due to thedifference in speeds of the belts 95- and |02 and the amount of overlapof -the various blanks in the stack |03 Will depend valves |58 and |59,respectively. The control valves |58 and |59 are actuated by shafts |60and I6I, respectively, to supply uid at a variable rate through ducts|62 and |83, respectively, to'the motors |50 and |5I. Excess fluid isreturned from the valves |58 and |59 through ducts v |64 and |65 to thereservoir |52. Fluid from the motors |50 and |5| is returned to thereservoir `|52 through pipes |66 and |61. The motors |50 'and I5I are ofa type such that their speed of operation is dependent upon the volumeof the lfluid supplied through the pipes |62 and |63. This in turn iscontrolled by the positions of the valves |58 and |59.

The valve |59 is 'controlled by the shaft |6| which is connected to ashaft I carrying a control handle |1|. The valve |58 is controlled bythe shaft |60 which is connected to a shaft |12 :carrying a pointer |13.

The control mechanism for the shafts |10 and |12 is shown in Figs. 3 and4. It will be noted Athat the shaft |10 carries a cam |15 against whicha cam follower |16 rests. This cam follower is mounted on a bell crank|11 and is held against the surface of the cam by a spring The bellcrank |11 is pivoted at I 19 to a fixed point and is pivoted at |80 to alink |8I. The link |8I is pivoted at |82 to an arm |83. The

.arm |83 is pivoted to swing about a fixed pin A plate |85 is pivotedfor parallel movement to v.links |86 and |81 which in turn are pivotedabout .fixed pins |88 and |84'respectively. The link |81 is pivoted tothe plate |85 by means of a pin |89 carried in a bracket |90 attached tothe plate |85 by means of screws I9 I.

The arm |83 is provided with an elongated slot |95 in which a cross head|96 slides. The cross head |96 is adjusted along the slot |95 by meansof a threaded shaft |91 journaled in brackets |98 and |99 carried by thearm |83 and having an adjusting handle 200. The cross head |96 carries apin which rides in the vertical slot i202 inthe plate |85. The crosshead |96 may be provided with a pointer 205 registering with a scale 206carried by the arm |83.

Link |86 is provided with an arm 2 |0 carrying a segment rack 2 I Imeshing with a segment gear 2|2 carried on and operating the shaft |12as indicated by the position of the pointer |13 on a scale 2I3. Forlimiting the movement of the shaft |12 and the pointer |13 in thelefthand direction as seen in Fig. 3 a hook 2|5 is provided which isadapted to be hooked over a stud 2| 6 when desired.

In the operation of the control linkage shown in Figs. 3 and 4 thehandle I1| is set in accordance with the desired speed of the motor I5 IThe cam |15 through the follower |16 and the linkage |8| swings the arm|83 about the pivot pin |84 a selected amount. Movement of the arm |83through the cross head |96 and the pin 20| causes a parallel movement ofthe plate 85. The ratio of the movement of the plate to the movement ofthe arm |83 is determined by the position of the crossvhead |96 withrespect to the slot |95. The cam 15 is so designed that the combinedeffect of the above described linkage is to shift the segment gear 2I|and shaft |12 by amounts to cause the motor |50 to operate at rateswhich bear a predetermined constant ratio to the rate of the motor |5|regardless of the position of the control handle |1I. This ratio isvaried by varying the position of the cross head |96 which in turn iscontrolled by the adjusting knob 200 and may be registered by thepointer 205 onthe scale 206. I

Inasmuch as the overlap of the folded blanks in the stack |03 isdetermined by the speed ratio of the belts and |02, the scale 206 may begraduated to read directly in the amount of overlap.

After the overlap has been set on the scale 206 by the adjusting knob200 the rate of feed of the conveyors may be varied by the controlhandle I'II. This will change the speeds of motors |50 and |5| asdesired but will maintain the predetermined speed ratio and thepredetermined overlap of the stacked blanks regardless of the conveyorspeeds.

It may be desirable to stop the motor |5| orto operate this motor at acomparatively low speed for selected periods of time. At the same timeit may be undesirable to stop the drive of the conveyor belt |02completely as this would leave the stack |03 in the drying oven or otherapparatus to which they are fed thereby. In order'to prevent the belt|02 from being driven at a speed below a predetermined minimum speed thehook 2I5 may be placed over the stud 2I6. The apparatus will then beoperated in the above described manner until the pointer |13 reaches aposition such that the end of the hook 2|5 engages the stud 2|6. Whenthis occurs further movement of the pointer |13 and its associated shaft|12 is prevented. If the handle I1I is moved to the left beyond thepositionat which the hook 2|5 engages the stud 2|6, the follower |16 isprevented from following the cam |15 and is held disengaged by the hook2|5. Hence the motor |5I may be slowed down to any predetermined speedor may be stopped Without stopping the motor |50 completely. Under thiscondition the stack |03 may be run out of the machine after which themotor |50 may be stopped by disengaging the hook 2 I5 and allowing thepointer |13 and the shaft |12 to move to the extreme left position underthe influence of the spring |18. Y

It will be` noted that by means of the present invention the relativedrive speeds of thetw'ormotors may be controlled simultaneously orselectively as desired and that any desired speed ratios may bemaintained regardless of variations in the actual speeds of the twomotors.

While the invention has been shown as applied to a particular type ofbox blank folding and stacking machine, it is to be understood that thecontrol mechanism may be applied to any type of machine wherein twoelements are to be driven under the relative conditions above mentionedand the invention is not to be restricted to the particular type ofmachine which has been indicated for purposes of illustration. Variouschanges and adaptations andfurther applications of the invention'will bereadily apparent to a person skilled in the art. The invention is onlyto be restricted in accordance with the scope of the following claims.

What is claimed is:

l. A mechanism for controlling the respective speeds of a pair of drivenmembers having individual speed control elements, comprising apositioning means for each element, a settable member connected tocontrol one of said positioning means, a linkage actuated by saidsettable member to set the other of said positioning means, said linkageincluding a cam member shaped to relatively position said speed control,

elements so as to maintain a constant speed ratio between said drivenmembers for all settings of said settable member, a cam followerengaging said cam member, a pivoted arm actuated by said cam follower, alaterally shiftable member connected to actuate the other of saidpositioning members, means `connecting said pivoted arm to actuate saidlaterally shiftable member with a parallel motion, and adjusting meansconnected to shift said connecting means with respect to the pivot pointof said pivoted arm for varying said speed ratio.

2. A mechanism for controlling the respective speeds of a pair of drivenmembers having individual speed control elements, comprising apositioning means for eachelement, a settable member connected tocontrol one of said positioning means, a linkage actuated by saidsettable member to set the other of said positioning means, said linkageincluding a cam member shaped to relatively position said speed controlelements so asto maintain a constant speed ratio between said drivenmembers for all settings of said settable member, a cam followerengaging said cam member, a pivoted arm actuated by said cam follower, amember mounted for parallel movement, pivot means connecting said arm toshift said last member, and a link actuated by said last member to setsaid otherV positioning means.

3. A mechanism for controlling the respective speeds of a pair of,driven members having individual speed control elements, comprising apositioning means for each element, a settable mem.- ber connected tocontrol one of said positioning means, `a linkage actuated by saidsettable member to set the other of Said positioning means, said linkageincluding a cam member shaped to relatively position said speed controlelements so as to maintain a constant speed ratio between said drivenmembers for all settings of said settable member, a cam followerengaging said cam member, a pivoted arm actuated by said cam follower, amember mounted for parallel movement,

pvot means connecting said arm to shift said last member, a linkactuated by said last member vto set said other positioning means, andmeans adjusting the position of said pivot means along said arm to Varysaid speed ratio. i

' LAWRENCE S. BROWN.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES ini'rrlri'rs Hoffman et al June 25, 1940

